so diff to ask your question
most of the bank website do have the calculator for you to calculator how much money you should have for your retirement
1. your monthly debts (mortgage, creidt card, loan etc)
2. your monthly expense (utility, travel, living)
3. your monthly income (pension, government MPF)
4. your life style (how many travel per year..etc)
diff people will have diff requirement, for me.. ha ha, if I have $3M, I could retire... I am working on it now